MS 661 C-M
- $1,189.95DSRP

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A professional chainsaw with enhanced fuel efficiency and STIHL M-Tronic™ technology.

Featuring an impressive power-to-weight ratio and STIHL M-Tronic™ engine management technology, the MS 661 C-M is a professional chainsaw designed for felling large diameter trees. With less vibration and 20% greater fuel efficiency than the MS 660, this saw also features a long-life filter system using HD-2 filter elements to provide longer run times between maintenance, an ElastoStart™ handle an...Read More

STIHL M-Tronic™ This product features M-Tronic™ (M) - a new generation of Intelligent Engine Management that eliminates the low and high speed carburetor adjustment screws, compensates for dirty air filter and changes in elevation and fuel quality for optimum engine power at all times.

Decompression Valve
The decompression valve, also referred to as 'deco' or 'deco valve', vents compression in the cylinder for easier starting. The decompression valve temporarily reduces the compression in the combustion chamber during cranking and helps reduce the effort needed to pull the starter rope. It is opened manually and closes automatically as soon as the engine fires.

STIHL ElastoStart™
The ElastoStart™ starter handle is an exclusive feature of STIHL. It is a starting grip with a built-in shock absorber that helps reduce the effort when pulling on the starter cord. The ElastoStart™ starter grip noticeably reduces the sudden peak forces (compression) normally felt during cranking. The forces which occur at the grip after the first compression stroke are smoothed out.

Adjustable Automatic Oiler
The Adjustable Automatic Oiler allows the user to adjust the lubricant of the guide bar and saw chain for different bar lengths and cutting conditions.

Toolless fuel and oil caps with retainersSimply lift the lever and twist the caps to remove or tighten. There‘s no need to use a tool to tighten or loosen.

Side-Access Chain TensionerThe side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw.

Anti-Vibration System
STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.

Standard Features

Common Features for ChainsawsView the features common to many STIHL chainsaws.

STIHL recommends the use of green reduced kickback bars and green low kickback chains on all STIHL chainsaws.

* The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.

Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…

WARNING! Improper use of any power tool may cause serious
or fatal injury. Read, understand and follow carefully the operating
and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.

We Also Suggest

HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.

•2.6 oz. bottle makes 1 gallon mix

•5.2 oz. bottle makes 2 gallon mix

•6.4 oz. bottle makes 2 1/2 gallon mix

•12.8 oz. bottle makes 5 gallon mix

STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

For Your Safety

If you are a tree care or emergency service professional working along roadways, we recommend the Pro Mark™ Hi-Vis Zip Chaps. They combine full wrap-around lower leg protection with high-visibility nylon fabric that meets Class E reflective requirements and earns a Class 3 reflective rating when worn with the Class 2 reflective vest. The chaps also feature reflective tapes made from Reflexite Brilliance Series GP-340, making them visible by motorists traveling up to 50 mph. Inside, there are nine layers of
Avertic™ Pro by Engtex® cut retardant material, helping reduce the risk or severity of injury in the event of contact with a rotating saw chain on a gasoline-powered chainsaw. Rows of heavy-duty zippers run along the entire inseam of the chaps, helping to ensure they are an effective fit and are easy to put on and/or remove. Stop by our showroom today and check out these versatile chaps.

Tough protection that also looks the part. The STIHL Deputy Glasses meet ANSI standard Z87.1+ and feature both protection and style. The lenses are a scratch-resistant polycarbonate that block out 99.9% of the sun’s harmful UV rays. They are also comfortable to wear, featuring a soft rubber nosepiece and dual-mold rubber temples that helps to keep the glasses in place when the head is in motion. Stop by our Dealership to check out these and other great protective eyewear styles. Shown in Brown Frame / Brown Mirror Lens. Available lens colors (Black Frame): Blue Mirror, Smoke (Brown Frame): Brown Mirror

Durable and hardworking, STIHL Pro Mark™ Dynamic Gloves deliver professional-grade hand protection. The palm and inner fingers are made of full grain tanned leather, so you can work with comfort without sacrificing a firm hold. Featuring multiple layers of cut-retardant materials – Avertic® Pro and Dyneema fabrics by Engtex® – these gloves will help deliver protection without compromising the dexterity you need while operating a chainsaw. Accented with an orange rip-stop nylon backing, these dynamic gloves offer style and protection. Water repellant, breathable and featuring a Velcro wrist closure, STIHL Pro Mark™ Dynamic Gloves are as ready for the woods as you.

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Distributor Suggested Retail Price

All pricing on this site is Distributor Suggested Retail Price. This site strives to maintain accurate and current suggested retail pricing. However, dealers' actual prices may vary or change. Please confirm pricing with your dealer

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MS 661 C-M Description

Featuring an impressive power-to-weight ratio and STIHL M-Tronic™ engine management technology, the MS 661 C-M is a professional chainsaw designed for felling large diameter trees. With less vibration and 20% greater fuel efficiency than the MS 660, this saw also features a long-life filter system using HD-2 filter elements to provide longer run times between maintenance, an ElastoStart™ handle and a high output adjustable oiler. Wrap-handle version available in select areas. See MS 661 R C-M.

MS 661 C-M

MS 661 C-M

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MS 661 C-M is rated 4.5 out of 5 by 45.

Rated 4 out of 5 by Lanceferd from Great SawThis is a great saw for large jobs. It can be a bit heavy after about an hour of use but it can get the job done.I was hoping that it would have just a bit more power than it does, but it still does what I need. Can be a bit tough to start at times.

Date published: 2017-09-20

Rated 3 out of 5 by Bobrobert from chain blade nuts spin off while in use no matter how tightly torquedFirst of all , I run a tree service and got this saw to cut tree stumps. Plenty of power but blade nuts spin off after about one minute of use. No matter how tight, there's been times I thought I was going to break the stud off. I had to buy nylon self locking nuts to use it. Good luck!

Date published: 2017-09-08

Rated 5 out of 5 by Danny2017NC from Nice hefty sawShy of an 880 for milling or clearing the rainforests - I can't imagine anyone needing a bigger saw. The 661 is a beast. It don't find huge power advantage over the 461, but it's noticeable. Love the MTRONIC. This saw doesn't let down.

Date published: 2017-08-21

Rated 5 out of 5 by jaybirdm from Powerful sawI see a lot of people having a problem with the saw starting after running hot or after running for long periods of time. I found when you re-start any of the saws just pull the cord with out choking or doing anything you would do when cold starting and especially with the mtronics. Usually starts every time one pull because the gas is already there.if you re-choke after running hot, it floods the carburetor causing the no starts.Just pull the cord. Unleash the beast.

Date published: 2017-08-04

Rated 5 out of 5 by GebhardtStihl from I'm a 3rd generation timberman. Being a Missouri family with German heritage, we have always known what the best saw out there is... Stihl!This saw has made so many advancements, I am very impressed. Have solely operated it for one year now without a hitch, has never shut off when laid down during idle. If you can handle the few extra pounds, the gas tank is larger for fewer fill ups throughout the day, new anti-vibration mounts and springs have really improved kickback vatigue, as well as new air filters. Also, the chain cap cover has nuts that stay in once loosened. Overall, I have not found anything I don't like about the brilliantly engineered advancements that have been developed. Dependability at its finest but hold on, this chainsaw aien't for boys! Way to go Stihl, cheers to taking such pride in the development of this awesome chainsaw.

Date published: 2017-07-28

Rated 5 out of 5 by Phoenixiv from Tree eating beastI have a small hard wood timber farm of a few hundred acres and needed to fell and buck some very large red oak, ash and maple. So far I'm into about 70 hours on the saw and it starts on the second pull almost every time. Today when it was 88 degrees out and I stopped for a 20 minute break it didn't act like it wanted to start. I turned ignition to off cranked it three times and then did a normal start and it took right off. Saw has a great power to weight ratio and it's easy to clean and maintain after use. I Stihl (pun intended) use an 044 for light use and a new 193T for in tree work. The 044 has got to be 16 or so years old and still cuts like there's no tomorrow. I clean and tune my own equipment and keep them lubed and clean, they seem to last which brings down the investment when you consider the equipment should last you for many years if properly maintained.

Date published: 2017-07-08

Rated 5 out of 5 by Grizzly1979 from Beast of a sawOriginally bought this saw for milling,but decided to use it for my felling needs and I've never looked back Im pretty sure I'll never come across anything this saw can't handle.ive ran 066 and 660s and this saw is way above them as far as power and torque and the m tronic take the guess work out of tuning and adjusting for conditions.its been very reliable so far usally two pills and it fires right up.Thos is most definitely a pro grade saw,I had to order mine cause trees companies in my area bought my dealer out.truly the best saw out of the 4 Stihl saws I own and it definitely kept the Stihl reputation up as being the best .thanks Stihl!!!

Date published: 2017-05-23

Rated 5 out of 5 by SlabbinAdam from Alaskan mill powerhouseI bought this saw to run a 36" Granberg mill through hardwoods. I put a 42" bar with ripping chain on and the mill gives a touch over 33" of cutting width with that set up. The widest I've had a chance to cut has been about 28" over short runs, with sustained cuts out to about 20". With a sharp chain the saw walks through all that without a second thought. I'll be taking down a big maple soon and working the mill at max width all day on it, I'll update my review once I do. My only complaint with this saw is it can be a little finicky to start when it's hot, but we just find clean up tasks to kill 30 minutes and it fires up first or second pull once things have cooled down. That or just hold the throttle wide open rather than using the automatic Start setting. The details on this saw are great too - love the fuel caps, love the easy adjust chain tension, love the embedded bolts on the chain retainer plate so we aren't chasing nuts around a dirty job site. This is my first Stihl and I'm a convert now. This is a big, expensive saw and it's a lot to throw around, but if you need the power it's your only option & it delivers.

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STIHL IS THE NUMBER ONE SELLING BRAND OF GASOLINE-POWERED HANDHELD OUTDOOR POWER EQUIPMENT IN AMERICA.*

*"Number one selling brand" is based on syndicated Irwin Broh Research as well as independent consumer research of 2009-2016 U.S. sales and market share data for the gasoline-powered handheld outdoor power equipment category combined sales to consumers and commercial landscapers.

*A majority of STIHL gasoline-powered units sold in the United States are built in the United States from domestic and foreign parts and components.